diff options
Diffstat (limited to 'resources/libraries/python')
| -rw-r--r-- | resources/libraries/python/DropRateSearch.py | 73 |
1 files changed, 69 insertions, 4 deletions
diff --git a/resources/libraries/python/DropRateSearch.py b/resources/libraries/python/DropRateSearch.py index 4bbf16c1a2..39f4655db4 100644 --- a/resources/libraries/python/DropRateSearch.py +++ b/resources/libraries/python/DropRateSearch.py @@ -58,6 +58,8 @@ class DropRateSearch(object): self._rate_start = 100 #step of the linear search, unit: RateType (self._rate_type) self._rate_linear_step = 10 + #last rate of the binary search, unit: RateType (self._rate_type) + self._last_binary_rate = 0 #linear search direction, permitted values: SearchDirection self._search_linear_direction = SearchDirection.TOP_DOWN #upper limit of search, unit: RateType (self._rate_type) @@ -73,7 +75,7 @@ class DropRateSearch(object): #size of frames to send self._frame_size = "64" #binary convergence criterium type is self._rate_type - self._binary_convergence_threshhold = "0.01" + self._binary_convergence_threshold = 100000 #numbers of traffic runs during one rate step self._max_attempts = 1 @@ -96,7 +98,7 @@ class DropRateSearch(object): :type loss_acceptance: float :type loss_acceptance_type: LossAcceptanceType :type traffic_type: str - :return: drop threshhold exceeded? (True/False) + :return: drop threshold exceeded? (True/False) :rtype bool """ pass @@ -186,6 +188,23 @@ class DropRateSearch(object): """ return self._duration + def set_binary_convergence_threshold(self, convergence): + """Set convergence for binary search + + :param convergence: treshold value number + :type convergence: float + :return: nothing + """ + self._binary_convergence_threshold = float(convergence) + + def get_binary_convergence_threshold(self): + """Get convergence for binary search + + :return: treshold value number + :rtype: float + """ + return self._binary_convergence_threshold + def get_rate_type_str(self): """Return rate type representation @@ -294,8 +313,54 @@ class DropRateSearch(object): elif self._search_result in [SearchResults.SUCCESS, SearchResults.SUSPICIOUS]: return self._search_result_rate - def binary_search(self): - raise NotImplementedError + def binary_search(self, b_min, b_max, traffic_type): + """Binary search of rate with loss below acceptance criteria + + :param b_min: min range rate + :param b_max: max range rate + :param traffic_type: traffic profile + :type b_min: float + :type b_max: float + :type traffic_type: str + :return: nothing + """ + + if not self._rate_min <= float(b_min) <= self._rate_max: + raise ValueError("Min rate is not in min,max range") + if not self._rate_min <= float(b_max) <= self._rate_max: + raise ValueError("Max rate is not in min,max range") + if float(b_max) < float(b_min): + raise ValueError("Min rate is greater then max rate") + + #binary search + #rate is half of interval + start of interval + rate = ((float(b_max) - float(b_min)) / 2) + float(b_min) + #rate diff with previous run + rate_diff = abs(self._last_binary_rate - rate) + + #convergence criterium + if float(rate_diff) < float(self._binary_convergence_threshold): + if not self._search_result_rate: + self._search_result = SearchResults.FAILURE + else: + self._search_result = SearchResults.SUCCESS + return + + self._last_binary_rate = rate + + res = self.measure_loss(rate, self._frame_size, + self._loss_acceptance, + self._loss_acceptance_type, + traffic_type) + #loss occured and it was above acceptance criteria + if res == False: + self.binary_search(b_min, rate, traffic_type) + #there was no loss / loss below acceptance criteria + elif res == True: + self._search_result_rate = rate + self.binary_search(rate, b_max, traffic_type) + else: + raise RuntimeError("Unknown search result") def combined_search(self): raise NotImplementedError |